Benchmark: Object spread vs Object.assign vs simple assignement

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

const firstObject = {}
firstObject.key1 = 'Hello world';
firstObject.key2 = 'foo bar';
firstObject.key3 = '42';
firstObject.key4 = 'Hitch Hikers Guide to the Galaxy';

const secondObject = {}
firstObject.key3 = 'Hello world';
firstObject.key4 = 'foo bar';
firstObject.key5 = '42';
firstObject.key6 = 'Hitch Hikers Guide to the Galaxy';

Tests:

spread
const firstObject = {} firstObject.key1 = 'Hello world'; firstObject.key2 = 'foo bar'; firstObject.key3 = '42'; firstObject.key4 = 'Hitch Hikers Guide to the Galaxy'; const secondObject = {} firstObject.key3 = 'Hello world'; firstObject.key4 = 'foo bar'; firstObject.key5 = '42'; firstObject.key6 = 'Hitch Hikers Guide to the Galaxy'; const output = { ...firstObject, ...secondObject }
Object.assign
const firstObject = {} firstObject.key1 = 'Hello world'; firstObject.key2 = 'foo bar'; firstObject.key3 = '42'; firstObject.key4 = 'Hitch Hikers Guide to the Galaxy'; const secondObject = {} firstObject.key3 = 'Hello world'; firstObject.key4 = 'foo bar'; firstObject.key5 = '42'; firstObject.key6 = 'Hitch Hikers Guide to the Galaxy'; // Note this does modify and return the first object, doesn't create a new one const output = Object.assign(firstObject, secondObject);
manually assigning
const firstObject = {} firstObject.key1 = 'Hello world'; firstObject.key2 = 'foo bar'; firstObject.key3 = '42'; firstObject.key4 = 'Hitch Hikers Guide to the Galaxy'; const secondObject = {} firstObject.key3 = 'Hello world'; firstObject.key4 = 'foo bar'; firstObject.key5 = '42'; firstObject.key6 = 'Hitch Hikers Guide to the Galaxy'; // Note this does modify and return the first object, doesn't create a new one for (const key in secondObject) { firstObject[key] = secondObject[key] } const output = firstObject;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
Object.assign
manually assigning

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 5 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0

Browser/OS: Firefox 147 on Windows

View result in a separate tab

Object.assign

21.8M/s

manually assigning

20.1M/s

spread

7.2M/s

View exact numbers

Test name	Executions per second
✓ Object.assign	21,834,066 Ops/sec
manually assigning	20,081,378 Ops/sec
spread	7,216,038 Ops/sec

Object spread vs Object.assign vs simple assignement (version: 1)

Comparing performance of: `spread vs Object.assign vs manually assigning`

Created: 8 months ago by: Guest

Go to the latest result

spread

Object.assign

manually assigning

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Object spread vs Object.assign vs simple assignement (version: 1)

Comparing performance of: spread vs Object.assign vs manually assigning

Created: 8 months ago by: Guest

Go to the latest result

spread

Object.assign

manually assigning

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `spread vs Object.assign vs manually assigning`